R2,D0,S0-3,11,B0-5,NN
A pretty sparse and stable rule with multiple failed c/2o and c/2d simpified spaceship heads.
These failed spaceship heads form multiple interesting oscillators and spaceships.
Known Speeds
c/2o
c/2d
2c/4o
2c/4d
3c/6d
4c/8d
9c/18o
12c/38o
20c/40o
21c/42d
41c/82o
78c/156d